Cannula



FIG. 1 is a top view of the invention;

FIG. 2 is a bottom view of the invention;

FIG. 3 is a left-side view of the invention, the right-side view being a mirror image thereof;

FIG. 4 is a front view of the invention; and,

FIG. 5 is a back view of the invention. 

CLAIM The ornamental design for a cannula, as shown and described. 